Where I can download the application that support PAT file? To open this file, you install one of the applications from the list of software programs that you found here, you should be able to open, edit or convert the file with the PAT extension without any issue. When operating system does not recognize a filename extension, you receive the following message: If operating system recognizes the filename extension, it opens the file in the program that is associated with that filename extension.
When you click a file to open it, operating system examines the filename extension.
